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REN Ai-di, ZHANG Qi-chang. THE FLUTTER STUDY OF A TWO-DIMENSIONAL AIRFOIL WITH ASYMMETRY FREEPLAY[J]. Engineering Mechanics, 2006, 23(9): 25-29.
Citation: REN Ai-di, ZHANG Qi-chang. THE FLUTTER STUDY OF A TWO-DIMENSIONAL AIRFOIL WITH ASYMMETRY FREEPLAY[J]. Engineering Mechanics, 2006, 23(9): 25-29.
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THE FLUTTER STUDY OF A TWO-DIMENSIONAL AIRFOIL WITH ASYMMETRY FREEPLAY

  • School of Mechanical Engineering, Tianjin University, Tianjin 300072, China;2. Tianjin Campus of Navy Engineering University, Tianjin 300450, China

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  • Received Date: November 29, 2004
  • Revised Date: May 31, 2005
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  • The dynamic response of a two-dimensional airfoil with preload asymmetry freeplay, which is of coupled aeroelastic nonlinearity and structural nonlinearity, is analyzed using numerical method. Global bifurcation of the system is investigated as the speed ratio U*/UL* increases from zero to 1 gradually. The effects on the critical flutter point are investigated when the natural frequency ratio ω, freeplay clearance δ , airfoil-air mass ratio μ, preload M0, initial deflection αf and the initial values are varied. It is found that the chaotic motion does not occur in the asymmetry freeplay system and the amplitude of flutter motion is not affected by the initial values. Some useful suggestion for the airfoil design and maintenance are given in terms of the sensitive parameter leading to the change of the pitch-motion amplitude.
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